General Description
SIC6621JS is a high efficiency Primary Side Regulator and highly integrated PWM Power Switch for AC/DC
power supply applications. SIC6621JS operates in PFM mode at large load condition, with the load becomes
medium or light, the chip operates in Green mode to achieve high efficiency.
The SIC6621JS provides accurate constant voltage, constant current (CV/CC) regulation without requiring an
opto-coupler and the secondary control circuitry.It can achieve excellent regulation and high average efficiency.
Multi-mode operations of the SIC6621JS are utilized to achieve low standby power, high efficiency and audio & noise free.
SIC6621JS also offers rich protection features including Cycle-by-Cycle peak current limiting, UVLO, OTP,
load OVP, and VDD over voltage.
The SIC6621JS is available in SOP-7 package.
Features
Built-in Integrated Power BJT
Quasi-Resonant Primary Side Regulation (QR-PSR)
Control with High Efficiency
Built-in Compensation for Transformer Inductance
Tolerances
Adaptive Multi-mode PFM Control for Improving
Efficiency
Low stat-up current
Built-in Leading Edge Blanking (LEB)
Built-in Dynamic Base Drive
Audio Noise Free Operation
±5% CC and CV Regulation
Programmable Cable Drop Compensation (CDC)
in CV Mode
Built-in AC Line & Load CC Compensation
Build in Protections:
Short Load Protection (SLP)
Cycle-by-Cycle Current Limiting (OCP)
On-Chip Thermal Shutdown (OTP)
VCC OVP & UVP & Clamp
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